Pen



FIG. 1 is a left side perspective view of a pen in accordance with the new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a right side view thereof, the left side view being a mirror image thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines shown in FIG. 3 represent boundaries of the design, with the lines themselves and the area within them forming no part of the claimed design. 

CLAIM The ornamental design for a pen, as shown and described. 